Mr Watson added: “I felt very difficult there, because Unite funded my campaign, they didn’t nominate me, and I think he felt that I in some way was obligated to him personally then. And my obligation was to the Labour Party.

Advertising

“You may severely criticise me for taking the wrong position, and that’s fair, but I’m not going to be bullied by Len McCluskey.”

At the Labour conference in 2016, Mr McCluskey openly raised questions about Mr Watson’s position, saying it would be “interesting” to see what would happen if he attempted to renew his mandate.

And he has since accused the deputy leader of “manufacturing division” and behaving like a “low-budget remake of the Godfather” after Mr Watson complained of hard-left plans to gain control over the party.

Advertising

Asked if he felt Mr McCluskey was coming for him, Mr Watson replied: “Yes, he is coming for me. They’re upping their delegates and all of that.

“What will be, will be. He’s powerful enough, if he wants to take me out as deputy leader, he probably could, but that’s up to him.

“I’m just going to get on and try and bring everyone back together and do what I can as best I can.”

Mr Watson, who was elected deputy leader at the same time as Mr Corbyn took the top job in 2015, said he felt “more chilled out” after losing more than four stone in weight over a year.

“I do genuinely feel a lot calmer, a lot more in equilibrium, so I guess I am a bit more chilled out,” he said.

“This isn’t political, in fact there are the occasional days where I feel like maybe I’m too chilled out for the circumstances I find myself in.

“It adds to resilience and patience, and right now, being deputy leader of the Labour Party, those are two qualities I think are quite useful to me.

“The best bit about it for me is that it’s lifted a brain fog that I didn’t know was there. I feel like my mental acuity has improved, almost like my IQ has improved. I feel much sharper.”